Introduce a WebUI extension manifest and rewrite the asset bundler/server to support caller-supplied entry sets, extension-injected entries, and negotiated gzip. Key changes: add get_webui_extension_manifest() to helpers/extension, refactor Stop logic into stop_context() and reuse it from the connector `/stop` command, and add a new `/rename` slash command for chat naming. ui_bundler now accepts entry_urls, includes enabled extension entry files, raises the embedded text file size limit to 512 KiB, computes per-entry-set cache keys, and returns a bundle version based on the bundle signature. ui_server applies Starlette GZip middleware, adds routes (/, /index.html, /ui/index, /safe), serves splash/safe documents, injects the serialized webui_extension_manifest into the rendered index, and streamlines the /ui/asset-bundle endpoint with ETag and gzip handling. Also add multiple WebUI assets and fonts, new/updated plugin command YAML and Python command handlers, and corresponding tests covering bundling, commands, chat naming, and WebUI behaviors. Documentation (.dox.md) updated to reflect the new runtime contracts and guidance.
Introduce a UI asset bundler and delivery flow: adds helpers/ui_bundler.py to discover same-origin HTML/CSS/JS (<=40KiB), build a versioned JSON bundle, and serialize it for an authenticated /ui/asset-bundle endpoint (handlers added in helpers/ui_server.py with gzip and ETag support). Add webui/sw.js service-worker to accept a preload bundle, populate a per-version cache, serve bundled text entries immediately, and perform runtime caching/cleanup for eligible assets. Update webui/index.html to fetch the bundle asynchronously, send it to the worker, register the worker by bundle version, inline a non-blocking startup splash, and convert stylesheets to non-blocking preload loads. Expose extension readiness from webui/js/extensions.js (webui-extensions-loaded) so startup waits for Alpine and HTML extension loading. Add tests covering bundler behavior, service-worker expectations, and startup ordering.
